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TPS62913: TPS62913测得的纹波很大

Part Number: TPS62913

各位大佬请教一下,我用TPS62913设计了12V转5V的电路双层板,参数和布局按手册上的进行设计,但测得的纹波很大,测得的纹波德的峰峰值有10mv,请问一下是什么原因呢?这边附上原理图和PCB布局图

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